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Descripción
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| The paper gives a thorough analysis of a thin, modified surface layer of aluminium alloys after Laser Shock Processing (LSP) treatment. The aim of the investigation was to determine optimum process parameters using a factorial design and an analysis of variance. As the first experimental factor, a degree of overlapping, i.e. pulse densities of 900 and 2500 pulse/cm2, was chosen. The second factor was the type of material, i.e. aluminium alloys AlMgSiPb and AlSi1MgMn. LSP treatment of specimens was performed in the UPM Laser Centre (Madrid) with a Q-switched Nd:YAG laser with a wave length ë of 1064 ìm. Laser-pulse energy amounted to 1.9 J and pulse duration was 10 ns with the repetition rate of 10 Hz. A thermal effect of an interaction of the laser pulse at the material surface and a mechanical effect of shockwaves produced atomic shifts. Shifts at the level of atoms resulted in densification of dislocations and introduction of compressive residual stresses with a relatively high gradient. A process response at different treatment conditions was monitored by four variables. Evaluation was made with reference to surface roughness, variations of micorhardness and residual stresses, and surface corrosion resistance of the treated specimens. The evaluation of corrosion resistance was performed using potentiodynamic polarization tests with the use of potentiostat Voltalab 21 and corrosion cells CEC/TH, with a platinum auxiliary electrode and a saturated calomel reference electrode (SCE), products of Radiometer Analytical. Experiments were conducted at 22°C in a 3.5 % NaCl water solution of pH 7.0. Potentiodynamic tests were carried out at a scanning rate of 10 mV/s with the initial test potential -2000 mVSCE. | |
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Internacional
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Si |
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Nombre congreso
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First International Conference on Laser Peening |
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Tipo de participación
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960 |
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Lugar del congreso
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Revisores
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Si |
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ISBN o ISSN
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0000000000 |
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DOI
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Fecha inicio congreso
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15/12/2008 |
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Fecha fin congreso
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17/12/2008 |
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Desde la página
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1 |
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Hasta la página
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1 |
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Título de las actas
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PRESENTACIONES EN LA PÁGINA WEB DEL CONGRESO |